2 hours ago
2 hours ago - last edited 2 hours ago
When was it working ok last?
What changed with the phone in the meantime?
Is "no SIM card" the verbatim error message?
What make and model of phone is it?
Can you try the SIM in another unlocked phone to see what happens there?
Is her phone unlocked for use on any network?
Maybe try a replacement SIM?
If you need to contact 48 support about this then see the links in my signature below.